DEP is responsible for monitoring the quality of New Jersey’s water. One way by which this is done is through biological monitoring. The Fish and Headwaters’ Index of Biotic Integrity monitoring programs, also known as FIBI & HIBI, use fish and other aquatic species as measures of water quality. John Vile and Brian Henning, research scientists in DEP’s Division of Water Monitoring and Standards, Bureau of Freshwater & Biological Monitoring, sit down with Bob Bostock to discuss how the health of fish in streams can help scientists to assess the health and condition of the water, as well as to identify ecological changes.